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Co-authored-by: cobalt <61329810+cobaltt7@users.noreply.github.com>
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Description
This PR improves the clarity of the error message raised when no target Python versions are specified.
Previously, the message referenced the internal variable name:
target_versions must not be empty
The updated message is more user-facing and clearer:
At least one target Python version must be specified.
This change improves readability without modifying behaviour.
Checklist - did you ...
--previewstyle, following the stability policy?CHANGES.mdif necessary?